
/**
 * @file support.js
 */


var $ = Zepto;

/**
 * 检测设备对某些属性或方法的支持情况
 * @method $.support
 * @grammar $.support.orientation ⇒ Boolean
 * @param {Boolean} orientation 检测是否支持转屏事件，UC中存在orientaion，但转屏不会触发该事件，故UC属于不支持转屏事件(iOS 4上qq, chrome都有这个现象)
 * @param {Boolean} touch 检测是否支持touch相关事件
 * @param {Boolean} cssTransitions 检测是否支持css3的transition
 * @param {Boolean} has3d 检测是否支持translate3d的硬件加速
 * @example
 * if ($.support.has3d) {      //在支持3d的设备上使用
 *     console.log('you can use transtion3d');
 * }
 */

// TODO检测是否支持position: fixed
function detectPosFixed() {

}

var br = $.browser;

$.support = $.extend($.support || {}, {
    orientation: !(br.uc || (parseFloat($.os.version) < 5 && (br.qq || br.chrome))) && !($.os.android && parseFloat($.os.version) > 3) && 'orientation' in window && 'onorientationchange' in window,
    touch: 'ontouchend' in document,
    cssTransitions: 'WebKitTransitionEvent' in window,
    has3d: 'WebKitCSSMatrix' in window && 'm11' in new WebKitCSSMatrix(),
    // fix: detectPosFixed,
    pushState: 'pushState' in history && 'replaceState' in history,
    scrolling: '',
    requestAnimationFrame: 'webkitRequestAnimationFrame' in window

});

